<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let obj={
            "name":'zzk',
            "age":22
        }
        for (const key in obj) {
           console.log(`key ${key} of obj is ${obj[key]}`);
        }
        for (const iterator of obj) {
            console.log(iterator);
        }
    </script>
</body>
</html>